Mahabharata 8.30.14

शाकलं नाम नगरमापगा नाम निम्नगाजर्तिका नाम बाह्लीकास्तेषां वृत्तं सुनिन्दितम्

śākalaṃ nāma nagaramāpagā nāma nimnagājartikā nāma bāhlīkāsteṣāṃ vṛttaṃ suninditam

Our plain-language meaning of this verse is waiting for scholar review.